Hi Glenn,
Make sure you have the silicone o-rings in the rear diff outdrives to limit the amount the driveshaft can move.
If these are in place and this still happens you need to check the shock is built so there is 29mm between the bottom of the shock body and the top of the shock rod end. Any more travel than this with the standard kit shock positions could lead to the driveshaft falling out.
Hope this helps
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